2 
HIRUNDO. 295 
than that of under parts, and more continuous, though sometimes 
there is but little difference in the shade. The space just posterior 
to the collar generally appears lighter than on the belly. Usually, 
however, the rufous wash of under parts is decidedly paler than that 
of throat and forehead ; sometimes quite pale; in only one or two 
instances as light as European specimens (as 6,020 and 29,294). In 
such cases, however, the absence of broad jugular band of continuous 
black, and the shorter tail, will distinguish from the European bird. 
There is an occasional tendency to a widening of the jugular 
collar, especialiy in young birds, but this is so much mixed with 
rufous feathers as to be easily understood. 
In young birds the frontal chestnut band is considerably reduced 
in size, and generally paler and duller in color. 
The largest specimen of H. horreorum I have seen is No. 19,542, 
from Fort Rae. Here the wing measures 4.90, and the tail 4.50 
(the usual length of tail is under 4.00); the next largest specimen 
being No. 34,349, from the Rocky Mountains. The maximum length 
of tail in specimens of H. rustica, of HKurope, before me, is 5.00— 
the average being perhaps 4.50. 
- The series of specimens from western America is not sufficient to 
determine whether there is any essential difference ; the bill, however, 
appears decidedly smaller. 
I regret very much that the specimens from South America‘ at my 
command are too few to make a satisfactory comparison with the 
North American bird. There appears, however, to be a difference 
in a rather smaller bill, and in having the gloss of the upper parts 
steel green, rather than purple or violet. I am, however, much 
inclined to doubt whether there is any specific difference. The 
chestnut brown of the forehead is quite as deep and extensive as in 
the northern bird, although Burmeister describes it as whitish, pass- 
ing behind into rust-yellow, and speaks of the whole under parts 
! Hirundo erythrogaster. 
Hirundo erythrogaster, Bopp. Tabl. Pl. enl. (724, fig. 1), 1783, 45 (Cay- 
enne).—ScLaTER, Catal. 1861, 39 (Brazil). 
Hirundo rufa, Gm. S. Nat. I, 1788, 1018 (Pl. enl. 724, fig. 1).—Burm. 
Ueb. III, 148 (Brazil). 
Hirundo cyanopyrrha, Viritu. Nouv. Dict. XIV, 1817, 510. 
| ' 
Smith- I Cottee- Sex d Wihter ; 
sonian| tor’s | and Locality. Gollscian Received from Collected by 
No. No. lAge, 
21,007 35 of Vermejo River. Feb. 1860. | Capt. Page, Expl. of Chr. Wood. 
21,008 35 g ue , - “« [Parana, Us 
